Telephone-transformer.



PATENTED MAY 7, 1907.

J. J. FRANK. TELEPHONfi TRANSFORMER. APPLICATION ITILED AUG. 14,1906.

Fig. 3.

Inventor John Frank b H fitt'y.-

UNITED sTarasryrsnr OFFICE.

JOHN J. FRANK, OF SCi-IENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY,

A CORPORATION OF NEW YORK.

TELEPHONE-TRANSFORMER.

Be it known that 1, JOHN J. FRANK, a citizen of the Unit-ed States, residing at Schenectady, county of Schenectady, State of New York, have invented. certain new and. useful Improvements in Telephone-Transformers, of which the following is a specification.

in connection with modern high potential electric transmission lines, it is common pracinto I. should be strong. and;

. ratus.

,i-of-my-present invention is the constructionof ransformor adaged to be osed be een-the telephone 6 proper and t e conducto I to-an individual telephone. t oriner, must of course, have its and secondary windings effectively insulated fromfleach other in order to pro The obj compactin construc-v tion, with its; effectively protected from the weather, aimed-it mustordmarily be placed'on a pole e to,thejweather.w

' The various feat ,mnovelty which characterize rnymven n: are pointed out with particulantyin-ithiclaims annexed to and forming a part of; "1'; 'ficat'ion.

For a better understhin of my invention and the manner in which. have attained the objects hereinbefoi esreferred to, referthe core structure emp once may be hadrto thehocompanying draw' In? in which igure 1 is a perspective view of a transformer constructed-in accordance with my invention; Fig. 2 is a lan view illustrating oyed; Fig. 3 is a section of the transformer, shown in Fi 1, and 4' is a section of the core on-the me 4-4 of ig. 2.

In the drawings, 1 represents a on shell-like member which may be shaped, ormed of Specification of Potters Patent. Application filed August LL 1906. Serial No. 330.561.

the telephonic lamina 12 being, a

uce the desired results, and

' andthe are surroun l Patented May 7, 1907.

cast iron or the like, and which has an axially disposed opening at its lower end in which is located a cylindrical bushing 2 of insulating material such as glass, porcelain or the like. The member 1 is provided with lugs 3 at one side. Supporting bolts may enter holes 4 formed in the lugs 3. 781 end the member 1 is provided with a radial] extending flange-portion 5. The lower e ge of the core 6, which is cylindrical in outline, is supported on the flange 5, from which it is separated by suitable insulating washers 7. second cup-she. (1 member 8 having a flange portion 9 simi ar to the flange ortion 5 1s sup orted from the upper side 0 the core by was ers 10 which, may be similar to the washers.7. The'members 1 and 8, core 6, and washers 7 and 10, are firmly secured together by transverse bolts 11. The core is com osed of laminae 12 of the form shown in-ful lines in Fig. 2. Each proximately E shaped. The windings oft e transformer comprise a secondary coil 13 which surrounds the middle tongues of the p'unchings,- and a primay coil 14 which surrounds the coil 13 e terminals 1-5 of the coil 14 which are connected to the line circuit pass out through the bore in the insulating bushing 2. The terminals 16 of the coil 13 pass laterally out/of the member 1 through an elbow pipe section 17 which may be adjustably secured to the member 1. sulated from each other by cylindrical line member 18 ob'suitable insulatir? material, I g e and separated'from the core by insulation 19.

' The transformer core is assembled after the windings are formed. As shown by Figs. 1, 2 and 4, the adjacentpunchings 12 are reversed with respect to each other so that the sections of the, core by the line 4 4 have in them a. thickness of ir half that of the p'ortion of the core surrounded by the windings. The narrow openings through these sections of the core may be closed, to protect the windings against the weather, by dipping the At its up transformer after assembly in insulating paint.

The arm ement described possesses excellent electrical and mechanical properties. The coils 13 and 1'4 are effectively insulated from each other. The core, due to the large overlap of the E -shaped members'that com- The coils 13 and 14 are ining eurrei'iis.

pose ii, has a low 'magnetie-reluetenee end said core within the casing, the lower of said consequently requires only a smell magnetising current, so that only a small current is needed for ringing, While by formin the lam inaiions of in h resistance steel, osses are relatively sin :11 with the high frequency talk- The construction 18 very compact and the core and windings are well protected from mechanical injury and from the weather. If desired the frame 1 may be 0on neoted to earth by a conductor at 20.

What I'elaim as new and desire to secure g by Letters Patent of'the United States, is,- i

l. In tmnsfornn'er, two cup-shaped members, a magnet-1e core clamped between, sand members and forming therewith an inelosing casing, n'inniry and secondary windings on said (tore wiihin the re ng, the lower of said members being exmnded downwardly below i said \VHHlRIlgS and provided with an opening 5 at its bottom, and an insulating bushing extending through said opening and providing a passage for the prin'iery leads of the transformer.

2. In atransformer, two cup-shaped members, a inngnetie core clumped between said E members being exiended downwardly below said windings and provided with a large 'opening at its bottom end a smaller down- 3. In a transformer, fiwo cup-shaped members, a magnetic core clamped between said me n bers and forming therewith an inelosing easing, primary and secondary windin s on said core within the casing, the lower of said members and forming therewith an inclosing easing, primary endseeondury windings on i said windii'igs and mei'nbers being extended downwardly below pmvirled with. an opening at its bottom, in insulating bushing; extend ing through said openin and providing. a passage for die primary lends of-the transformer, and; supporting lugs on said lower member.

In witness whereof, I have hereunto set my hand this 11th day of August, 1906.

. JOHN J. FRANK.

Witnesses:

BENJAMIN B. HULL, Glmpm M. HANIGAN. 

